來源：http://www.voirpourcomprendre.com/ 日期：2021-01-28 發布人：sanwa8
Porcine blue ear disease, also known as porcine reproductive and respiratory syndrome (PRRS), is a family of porcine reproductive and respiratory syndrome virus caused by arteritis virus. It was introduced into China from abroad and seriously affected the pig industry. Infectious diseases, reproductive disorders, dyspnea, blue and purple ears, complex and other infectious diseases are the main characteristics. At present, there is no specific treatment, so it is necessary to do a good job in the prevention of this disease. Pig concentrate
1. Epidemic characteristics: there is no obvious seasonality of PRRS under normal conditions. The main route of transmission is respiratory tract. Infected pigs and poisoned pigs can poison the air and pollute the surrounding environment. If no disinfection measures are taken, the virus will exist in the pigsty for a long time. Abrupt climate change and the introduction of pigs are often the causes of the disease.
Clinical features: (1) sow: fever, anorexia, depression, drowsiness, dyspnea, cough. Abortion, stillbirth, frailty or premature birth in the third trimester of pregnancy. Postpartum no milk, a few sick pigs ears purple, subcutaneous blood spots. Nerve paralysis and other symptoms were found in some sows. (2) Pig: eye edema, conjunctivitis, eye secretions or suppuration, and dyspnea, nose purple, depressive sleepiness and other symptoms.
The performance of boar is cough, lack of energy, loss of appetite, shortness of breath, semen temporarily reduced and vitality decreased. (3) Piglets: piglets less than 1 month old are easy to be infected. Body temperature can reach more than 40%, dyspnea, sometimes abdominal breathing, loss of appetite or emaciation, hind limb paralysis, ataxia, eyelid edema, mortality as high as 80%. (4) Porcine blue ear disease is often secondary to classical swine fever, red blood cells and other diseases, if not treated in time, the mortality of pigs is high.
3. pathological changes: the skin is gray and nostril is bubbly; the trachea and bronchus are full of foam, and the water is more. Marbling changes of lung, hepatomegaly, gastric hemorrhage and edema; congestion of endocardium. The renal capsule is easy to fall off and there are large bleeding points on the surface of the tip. Eyelid edema is common in piglets and pigs. Subcutaneous edema, swelling of lymph nodes and hydropericardium were found in piglets.
4. Prevention and control measures: at present, there is no specific treatment for porcine blue ear disease. As this disease is often secondary to classical swine fever, porcine contagious pleuropneumonia, porcine lung disease, Eperythrozoon suis and other diseases, once infected with blue ear disease pig farms, in addition to the stillbirth, harmless treatment of dead pigs and enclosure disinfection, they should also feed sick pigs with high energy feed, multiple vitamins and sufficient electrolytes; sows should be properly fed aspirin before delivery. Antibiotics can be used to prevent secondary infection in the treatment of sick pigs. At the same time, appropriate medication according to different secondary infection diseases has a certain effect on the rehabilitation of sick pigs.